Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

None of these
Is not at all corrosive, even at a higher temperature
Can't attain high temperature at normal pressure
Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water

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Nuclear Power Engineering
Plutonium

Has much lower melting point (640°C ) compared to thorium (1690°C)
Neither A nor B
Is recovered from spent fuel from thermal nuclear reactor
Both A & B

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